Cycle of pulsed gamma rays from the Vela pulsar.

A pulsar (portmanteau of pulsating star) is a highly magnetized, rotating neutron star that emits a beam of electromagnetic radiation. This radiation can only be observed when the beam of emission is pointing towards the Earth, much the way a lighthouse can only be seen when the light is pointed in the direction of an observer, and is responsible for the pulsed appearance of emission. Neutron stars are very dense, and have short, regular rotational periods. This produces a very precise interval, between pulses that range from roughly milliseconds to seconds for an individual pulsar.

The precise periods of pulsars makes them useful tools. Observations of a pulsar in a binary neutron star system were used to indirectly confirm the existence of gravitational radiation. The first extrasolar planets were discovered around a pulsar, PSR B1257+12. Certain types of pulsars rival atomic clocks in their accuracy in keeping time.

The History of the Discovery and Study of Pulsars[link]

Composite Optical/X-ray image of the Crab Nebula, showing synchrotron emission in the surrounding pulsar wind nebula, powered by injection of magnetic fields and particles from the central pulsar.

The first pulsar was observed on November 28, 1967 by Jocelyn Bell Burnell and Antony Hewish.^[1][2][3] The observed emission from the pulsar was pulses separated by 1.33 seconds, originated from the same location on the sky, and kept to sidereal time. In looking for explanations for the pulses, the short period of the pulses eliminated most astrophysical sources of radiation, such as stars, and since the pulses followed sidereal time, it could not be man-made radio frequency interference. When observations with another telescope confirmed the emission, it eliminated any sort of instrumental effects. At this point, Burnell notes of herself and Hewish that "we did not really believe that we had picked up signals from another civilization, but obviously the idea had crossed our minds and we had no proof that it was an entirely natural radio emission. It is an interesting problem—if one thinks one may have detected life elsewhere in the universe, how does one announce the results responsibly?"^[4] Even so, they nicknamed the signal LGM-1, for "little green men" (a name for intelligent beings of extraterrestrial origin). It was not until a second pulsating source was discovered in a different part of the sky that the "LGM hypothesis" was entirely abandoned.^[5] Their pulsar was later dubbed CP 1919, and is now known by a number of designators including PSR 1919+21, PSR B1919+21 and PSR J1921+2153. Although CP 1919 emits in radio wavelengths, pulsars have, subsequently, been found to emit in visible light, X-ray, and/or gamma ray wavelengths.^[6]

The word "pulsar" is a contraction of "pulsating star",^[7] and first appeared in print in 1968:

An entirely novel kind of star came to light on Aug. 6 last year and was referred to, by astronomers, as LGM (Little Green Men). Now it is thought to be a novel type between a white dwarf and a neutron [sic]. The name Pulsar is likely to be given to it. Dr. A. Hewish told me yesterday: "… I am sure that today every radio telescope is looking at the Pulsars."^[8]

The suggestion that pulsars were rotating neutron stars was put forth independently by Thomas Gold and Franco Pacini in 1968, and was soon proven beyond reasonable doubt by the discovery of a pulsar with a very short (33-millisecond) pulse period in the Crab nebula.

In 1974, Antony Hewish became the first astronomer to be awarded the Nobel Prize in physics. Considerable controversy is associated with the fact that Professor Hewish was awarded the prize while Bell, who made the initial discovery while she was his Ph.D student, was not. Bell claims no bitterness upon this point, supporting the decision of the Nobel prize committee.^[9]

The Vela Pulsar and its surrounding pulsar wind nebula.

In 1974, Joseph Hooton Taylor, Jr. and Russell Hulse discovered for the first time a pulsar in a binary system, PSR B1913+16. This pulsar orbits another neutron star with an orbital period of just eight hours. Einstein's theory of general relativity predicts that this system should emit strong gravitational radiation, causing the orbit to continually contract as it loses orbital energy. Observations of the pulsar soon confirmed this prediction, providing the first ever evidence of the existence of gravitational waves. As of 2004, observations of this pulsar continue to agree with general relativity. In 1993, the Nobel Prize in Physics was awarded to Taylor and Hulse for the discovery of this pulsar.^[10]

In 1982, Don Backer led a group which discovered PSR B1937+21, a pulsar with a rotation period of just 1.6 milliseconds.^[11] Observations soon revealed that its magnetic field was much weaker than ordinary pulsars, while further discoveries cemented the idea that a new class of object, the "millisecond pulsars" (MSPs) had been found. MSPs are believed to be the end product of X-ray binaries. Owing to their extraordinarily rapid and stable rotation, MSPs can be used by astronomers as clocks rivaling the stability of the best atomic clocks on Earth. Factors affecting the arrival time of pulses at the Earth by more than a few hundred nanoseconds can be easily detected and used to make precise measurements. Physical parameters accessible through pulsar timing include the 3D position of the pulsar, its proper motion, the electron content of the interstellar medium along the propagation path, the orbital parameters of any binary companion, the pulsar rotation period and its evolution with time. (These are computed from the raw timing data by Tempo, a computer program specialized for this task.) After these factors have been taken into account, deviations between the observed arrival times and predictions made using these parameters can be found and attributed to one of three possibilities: intrinsic variations in the spin period of the pulsar, errors in the realization of Terrestrial Time against which arrival times were measured, or the presence of background gravitational waves. Scientists are currently attempting to resolve these possibilities by comparing the deviations seen amongst several different pulsars, forming what is known as a Pulsar timing array. With luck, these efforts may lead to a time scale a factor of ten or better than currently available, and the first ever direct detection of gravitational waves. In June 2006, the astronomer John Middleditch and his team at LANL announced the first prediction of pulsar glitches with observational data from the Rossi X-ray Timing Explorer. They used observations of the pulsar PSR J0537-6910.

In 1992, Aleksander Wolszczan discovered the first extrasolar planets around PSR B1257+12. This discovery presented important evidence concerning the widespread existence of planets outside the solar system, although it is very unlikely that any life form could survive in the environment of intense radiation near a pulsar.

Nomenclature[link]

Initially pulsars were named with letters of the discovering observatory followed by their right ascension (e.g. CP 1919). As more pulsars were discovered, the letter code became unwieldy and so the convention was then superseded by the letters PSR (Pulsating Source of Radio) followed by the pulsar's right ascension and degrees of declination (e.g. PSR 0531+21) and sometimes declination to a tenth of a degree (e.g. PSR 1913+167). Pulsars that are very close together sometimes have letters appended (e.g. PSR 0021-72C and PSR 0021-72D).

The modern convention is to prefix the older numbers with a B (e.g. PSR B1919+21) with the B meaning the coordinates are for the 1950.0 epoch. All new pulsars have a J indicating 2000.0 coordinates and also have declination including minutes (e.g. PSR J1921+2153). Pulsars that were discovered before 1993 tend to retain their B names rather than use their J names (e.g. PSR J1921+2153 is more commonly known as PSR B1919+21). Recently discovered pulsars only have a J name (e.g. PSR J0437-4715). All pulsars have a J name that provides more precise coordinates of its location in the sky.^[12]

Formation[link]

Schematic view of a pulsar. The sphere in the middle represents the neutron star, the curves indicate the magnetic field lines, the protruding cones represent the emission beams and the green line represents the axis on which the star rotates.

The events leading to the formation of a pulsar begin when the core of a massive star is compressed during a supernova, which collapses into a neutron star. The neutron star retains most of its angular momentum, and since it has only a tiny fraction of its progenitor's radius (and therefore its moment of inertia is sharply reduced), it is formed with very high rotation speed. A beam of radiation is emitted along the magnetic axis of the pulsar, which spins along with the rotation of the neutron star. The magnetic axis of the pulsar determines the direction of the electromagnetic beam, with the magnetic axis not necessarily being the same as its rotational axis. This misalignment causes the beam to be seen once for every rotation of the neutron star, which leads to the "pulsed" nature of its appearance. The beam originates from the rotational energy of the neutron star, which generates an electrical field from the movement of the very strong magnetic field, resulting in the acceleration of protons and electrons on the star surface and the creation of an electromagnetic beam emanating from the poles of the magnetic field.^[13][14] This rotation slows down over time as electromagnetic power is emitted. When a pulsar's spin period slows down sufficiently, the radio pulsar mechanism is believed to turn off (the so-called "death line"). This turn-off seems to take place after about 10–100 million years, which means of all the neutron stars in the 13.6 billion year age of the universe, around 99% no longer pulsate.^[15] The longest known pulsar period is 9.437 seconds.^[16]

Though this very general picture of pulsars is mostly accepted, Werner Becker of the Max Planck Institute for Extraterrestrial Physics said in 2006, "The theory of how pulsars emit their radiation is still in its infancy, even after nearly forty years of work."^[17]

Categories[link]

Three distinct classes of pulsars are currently known to astronomers, according to the source of the power of the electromagnetic radiation:

• Rotation-powered pulsars, where the loss of rotational energy of the star provides the power.
• Accretion-powered pulsars (accounting for most but not all X-ray pulsars), where the gravitational potential energy of accreted matter is the power source (producing X-rays that are observable from the Earth).
• Magnetars, where the decay of an extremely strong magnetic field provides the electromagnetic power.

The Fermi Space Telescope has uncovered a subclass of rotationally-powered pulsars that emit only gamma rays.^[18] There have been only about one hundred gamma-ray pulsars identified out of about 1800 known pulsars.^[19][20]

Although all three classes of objects are neutron stars, their observable behavior and the underlying physics are quite different. There are, however, connections. For example, X-ray pulsars are probably old rotationally-powered pulsars that have already lost most of their power, and have only become visible again after their binary companions had expanded and began transferring matter on to the neutron star. The process of accretion can in turn transfer enough angular momentum to the neutron star to "recycle" it as a rotation-powered millisecond pulsar. As this matter lands on the neutron star, it is thought to "bury" the magnetic field of the neutron star (although the details are unclear), leaving millisecond pulsars with magnetic fields 1000-10,000 times weaker than average pulsars. This low magnetic field is less effective at slowing the pulsar's rotation, so millisecond pulsars live for billions of years, making them the oldest known pulsars. Millisecond pulsars are seen in globular clusters, which stopped forming neutron stars billions of years ago.^[15]

Of interest to the study of the state of the matter in a neutron stars are the glitches observed in the rotation velocity of the neutron star. This velocity is decreasing slowly but steadily, except by sudden variations. One model put forward to explain these glitches is that they are the result of "starquakes" that adjust the crust of the neutron star. Models where the glitch is due to a decoupling of the possibly superconducting interior of the star have also been advanced. In both cases, the star's moment of inertia changes, but its angular momentum doesn't, resulting in a change in rotation rate.

Disrupted recycled pulsar[link]

When two massive stars are born close together from the same cloud of gas, they can form a binary system and orbit each other from birth. If those two stars are at least a few times as massive as our sun, their lives will both end in supernova explosions. The more massive star explodes first, leaving behind a neutron star. If the explosion does not kick the second star away, the binary system survives. The neutron star can now be visible as a radio pulsar, and it slowly loses energy and spins down. Later, the second star can swell up, allowing the neutron star to suck up its matter. The matter falling onto the neutron star spins it up and reduces its magnetic field. This is called “recycling” because it returns the neutron star to a quickly-spinning state. Finally, the second star also explodes in a supernova, producing another neutron star. If this second explosion also fails to disrupt the binary, a double neutron star binary is formed. Otherwise, the spun-up neutron star is left with no companion and becomes a “disrupted recycled pulsar”, spinning between a few and 50 times per second.^[21]

Applications (Uses)[link]

Relative position of the Sun to the center of the Galaxy and 14 pulsars with their periods denoted

The study of pulsars has resulted in many applications in physics and astronomy. Striking examples include the confirmation of the existence of gravitational radiation as predicted by general relativity and the first detection of an extrasolar planetary system.

The discovery of pulsars allowed astronomers to study an object never observed before, the neutron star. This kind of object is the only place where the behavior of matter at nuclear density can be observed (though not directly). Also, millisecond pulsars have allowed a test of general relativity in conditions of an intense gravitational field.

Pulsar maps have been included on the two Pioneer Plaques as well as the Voyager Golden Record. They show the position of the Sun, relative to 14 pulsars, which are identified by the unique timing of their electromagnetic pulses, so that our position both in space and in time can be calculated by potential extraterrestrial intelligences.^[22][23] Because pulsars are emitting very regular pulses of radio waves, its radio transmissions do not require daily corrections. Moreover, pulsar positioning could create a spacecraft navigation system independently, or be an auxiliary device to GPS instruments.^[24][25]

Precise clocks[link]

For some millisecond pulsars, the regularity of pulsation is more precise than an atomic clock.^[26] This stability allows millisecond pulsars to be used in establishing ephemeris time^[27] or building pulsar clock.^[28]

Probes of the interstellar medium[link]

The radiation from pulsars passes through the interstellar medium (ISM) before reaching Earth. Free electrons in the warm (8000 K), ionized component of the ISM and H II regions affect the radiation in two primary ways. The resulting changes to the pulsar's radiation provide an important probe of the ISM itself.^[29]

Because of the dispersive nature of the interstellar plasma, lower-frequency radio waves travel through the medium slower than higher-frequency radio waves. The resulting delay in the arrival of pulses at a range of frequencies is directly measurable as the dispersion measure of the pulsar. The dispersion measure is the total column density of free electrons between the observer and the pulsar,

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is the distance from the pulsar to the observer and Failed to parse (Missing texvc executable; please see math/README to configure.): n_e
is the electron density of the ISM. The dispersion measure is used to construct models of the free electron distribution in the Milky Way Galaxy.[30]

Additionally, turbulence in the interstellar gas causes density inhomogeneities in the ISM which cause scattering of the radio waves from the pulsar. The resulting scintillation of the radio waves—the same effect as the twinkling of a star in visible light due to density variations in the Earth's atmosphere—can be used to reconstruct information about the small scale variations in the ISM.^[31] Due to the high velocity (up to several hundred km/s) of many pulsars, a single pulsar scans the ISM rapidly, which results in changing scintillation patterns over timescales of a few minutes.^[32]

Probes of space-time[link]

Pulsars orbiting within the curved space-time around Sgr A*, the supermassive black hole at the center of the Milky Way galaxy, could serve as probes of gravity in the strong-field regime.^[33] Arrival times of the pulses would be affected by special- and general-relativistic Doppler shifts and by the complicated paths that the radio waves would travel through the strongly curved space-time around the black hole. In order for the effects of general relativity to be measurable with current instruments, pulsars with orbital periods less than about 10 years would need to be discovered;^[33] such pulsars would orbit at distances inside 0.01 pc from Sgr A*. Searches are currently underway; at present, five pulsars are known to lie within 100 pc from Sgr A*.^[34]

Significant pulsars[link]

Gamma-ray pulsars detected by the Fermi Gamma-ray Space Telescope.

• The first radio pulsar CP 1919 (now known as PSR 1919+21), with a pulse period of 1.337 seconds and a pulse width of 0.04 second, was discovered in 1967.^[35] A drawing of this pulsar's radio waves was used as the cover of British post-punk band Joy Division's debut album, Unknown Pleasures.
• The first binary pulsar, PSR 1913+16, whose orbit is decaying at the exact rate predicted due to the emission of gravitational radiation by general relativity
• The first millisecond pulsar, PSR B1937+21
• The brightest millisecond pulsar, PSR J0437-4715
• The first X-ray pulsar, Cen X-3
• The first accreting millisecond X-ray pulsar, SAX J1808.4-3658
• The first pulsar with planets, PSR B1257+12
• The first double pulsar binary system, PSR J0737−3039
• The longest period pulsar, PSR J2144-3933
• The most stable pulsar in period, PSR J0437-4715
• The magnetar SGR 1806-20 produced the largest burst of power in the Galaxy ever experimentally recorded on 27 December 2004^[36]
• PSR B1931+24 "... appears as a normal pulsar for about a week and then 'switches off' for about one month before emitting pulses again. [..] this pulsar slows down more rapidly when the pulsar is on than when it is off. [.. the] braking mechanism must be related to the radio emission and the processes creating it and the additional slow-down can be explained by the pulsar wind leaving the pulsar's magnetosphere and carrying away rotational energy."^[37]
• PSR J1748-2446ad, at 716 Hz, the pulsar with the highest rotation speed.
• PSR J1903+0327, a ~2.15 ms pulsar discovered to be in a highly eccentric binary star system with a sun-like star.^[38]
• A pulsar in the CTA 1 supernova remnant (4U 0000+72, in Cassiopeia) was found by the Fermi Gamma-ray Space Telescope to emit pulsations only in gamma ray radiation, the first recorded of its kind.^[18]
• PSR J2007+2722, a 40.8-hertz 'recycled' isolated pulsar was the first pulsar found by volunteers on data taken in February 2007 and analyzed by distributed computing project Einstein@Home.^[39]
• Geminga and PSR J0437-4715 are among the closest known pulsars to Earth

Video Gallery[link]

These are some videos of pulsars:

What is a Pulsar?

Pulsar Detection.

A pulsar blinking.

A star in a binary star system has collapsed to a neutron star.

See also[link]

Star portal

Notes[link]

References and further reading[link]

• Lorimer, Duncan R.; Kramer, Michael (2004). Handbook of Pulsar Astronomy. Cambridge University Press. ISBN 0-521-82823-6. http://books.google.com/books/about/Handbook_of_pulsar_astronomy.html?id=OZ8tdN6qJcsC. 
• Lorimer, Duncan R. (2008). "Binary and Millisecond Pulsars". http://relativity.livingreviews.org/Articles/lrr-2008-8/. 
• Lyne, Andrew G.; Graham-Smith, Francis (1998). Pulsar Astronomy. Cambridge University Press. ISBN 0-521-59413-8. http://books.google.com/books?id=AK9N3zxL4ToC. 
• Manchester, Richard N.; Taylor, Joseph H. (1977). Pulsars. W. H. Freeman and Company. ISBN 0-7167-0358-0. http://books.google.com/books/about/Pulsars.html?id=tcFlQgAACAAJ. 
• Stairs, Ingrid H (2003). "Testing General Relativity with Pulsar Timing". http://www.livingreviews.org/lrr-2003-5. 

External links[link]

Wikimedia Commons has media related to: Pulsars

• "Pinning Down a Pulsar’s Age". Science News.
• "Astronomical whirling dervishes hide their age well". Astronomy Now.
• Animation of a Pulsar. Einstein.com, 17 January 2008.
• "The Discovery of Pulsars." BBC, 23 December 2002.
• "A Pulsar Discovery: First Optical Pulsar." Moments of Discovery, American Institute of Physics, 2007 (Includes audio and teachers guides).
• Discovery of Pulsars: Interview with Jocelyn Bell-Burnell. Jodcast, June 2007 (Low Quality Version).
• Audio: Cain/Gay - Astronomy Cast. Pulsars - Nov 2009
• Listing for PULS CP 1919 (The First Pulsar), Simbad Database
• Australia National Telescope Facility: Pulsar Catalogue
• Johnston, William Robert. "List of Pulsars in Binary Systems." Johnston Archive, 22 March 2005.
• Staff Writers. "Scientists Can Predict Pulsar Starquakes." Space Daily, 7 June 2006.
• Staff Writers. "XMM-Newton Makes New Discoveries About Old Pulsars." Space Daily, 27 July 2006.
• Than, Ker. "Hot New Idea: How Dead Stars Go Cold." Space.com, 27 July 2006.
• "New Kind of Pulsar Discovered"[3]. Cosmos Online.
• Artist's Rendition of Pulsar. Digital Blasphemy.

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Armin van Buuren
Van Buuren performing on Queensday in Amsterdam, 2011
Background information
Birth name	Armin van Buuren
Also known as	Gaia, AVB
Born	(1976-12-25) 25 December 1976 (age 35) Leiden, South Holland, Netherlands[1]
Origin	Koudekerk aan den Rijn, South Holland, Netherlands
Genres	Trance Progressive Trance Uplifting Trance Neo-trance
Occupations	Remixer, Producer, DJ, Composer, Musician, Pianist, Songwriter
Instruments	Synthesizer, drum machine, equalizer, personal computer
Years active	1995–present
Labels	Armada Music (2003–present), Vandit (Co-Joined), Ministry of Sound Australia
Associated acts	Alibi, Dark Matter, Electrix, Lilmotion, Major League, Monsieur Basculant, Red & White, Technology, Triple A, Wodka Wasters, Nadia Ali,[2] Christian Burns,[2] Ferry Corsten,[2] Adam Young,[2] BT,[2] Sophie Ellis-Bextor,[2] Guy Chambers[2]
Website	arminvanbuuren.com

Armin van Buuren (Dutch pronunciation: [ˈɑr.mɪn vɑn ˈby.rə(n)]), OON (born 25 December 1976 in Leiden, Netherlands)^[1] is a Dutch trance producer and DJ. Between 2007 and 2010, he was voted number one in DJ Magazine's annual top 100 list of the most popular DJs.^[1] In the 2011 list, he ranked in second place. Since 2001, Van Buuren has hosted a weekly radio show called A State of Trance, which claims to have around 15 million weekly listeners in 26 countries,^[3] which would make it one of the most listened-to radio shows in the world. His 2008 studio album, Imagine, entered the Dutch album chart at #1, a first for a dance music artist in Dutch music history.^[4]

Personal life[link]

Armin van Buuren was born in Leiden, Netherlands on 25 December 1976,^[1] but grew up in Koudekerk aan den Rijn. Van Buuren started making music when he was 14.^{[citation needed]} He was inspired by French electronic music composer, Jean Michel Jarre, and wished to become a great electronic music composer like Jarre.^{[citation needed]}

He finished high school at the Stedelijk Gymnasium Leiden in 1995, and left for college to study law at Leiden University. While studying law, Van Buuren's interest for making music blossomed, and he began working as a DJ in a local club called Nexus. As his musical career began to take off, he put his law degree on hold, although he did return to finish law school in 2003.

On 18 September 2009, Van Buuren married Erika van Thiel in Wassenaar, Netherlands. They met during a vacation on Crete, and had been together for nine years prior to the marriage.^[5][6]

On 12 January 2011, Van Buuren announced the pregnancy of his wife Erika on Twitter.^[7] He hoped the baby, due that summer, would be his "best production ever."^[7] Their daughter, Fenna, was born on 24 July 2011.^[8]

Career[link]

This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (April 2012)

1995–1999: Early career and success[link]

In 1995, Van Buuren had his first major success with a track called "Blue Fear", which was released under the Cyber Records label; he was 19 years old at the time. This track, which was produced in the "Euro Trance" mold, made it onto the UK Chart. Another successful track, "Communication" was released under the same label, and became popular in Ibiza, Spain in the summer of 1999. After being signed to AM PM Records, this track entered the UK Chart at No. 18 in 2000.

Armin van Buuren at Lizard Lounge, Dallas, Texas, 9 August 2008

Van Buuren began his DJ career at club Nexus in Leiden, where he learned to play long DJ sets, which were regularly six to seven hours per set.^[9] During school holidays he played more than four times a week. In 1999, he met Dave Lewis who introduced him as a DJ in England and the United States.^[9] His career accelerated, entering the DJ magazine Top-100 in November 2001 at Number 27.^[9] He has played in more than 25 different countries and can often be found on the main stage at big summer festivals. Van Buuren played a record-breaking twelve and a half hour set for Dancetheater in The Hague (the Netherlands).^[10][11] In the United Kingdom he performs regularly at Passion (resident 2002), Godskitchen, Gatecrasher, Slinky, Ministry of Sound, Peach and Golden.

In the beginning of 1999, Van Buuren started his label Armind together with United Recordings. The first release, Gig – "One," was well received. The second release "Touch Me," under the name Rising Star was signed to Ministry of Sound in the UK, before the record was released.

By the time of his third release, Gimmick – "Free" was signed to R&S Records, Van Buuren had managed to make his label popular very quickly. Under the surname Gaia he released "4 Elements" on Captivating Sounds, a sub-label of Warner Brothers. Teaming up with Tiësto, two new projects were born: Major League – "Wonder Where You Are?" was released on Black Hole Recordings and Alibi – "Eternity" was released on Armind. "Eternity" received club and chart success and was signed to Paul van Dyk's imprint Vandit Records. Another major collaboration followed this. Together with Ferry Corsten, Van Buuren recorded a riff-classic titled "Exhale" for the System F. album. Released as a single, this track reached gold status in less than a month.

[edit] 2000–2004: A State of Trance and 76

In 2000, Van Buuren started his own Armin van Buuren compilation series. He managed to find a balance between progressive house,and vocal trance music styles. His first compilation album, A State of Trance (not to be confused with his weekly A State of Trance radio shows), sold more than 10,000 copies and contains Van Buuren's well known remix of Moogwai, "Viola." His second album, Basic Instinct featured a new track: "Perpetuous Dreamer" – "The Sound of Goodbye." This track entered the Dutch charts in June 2001 at number 26. Later in the year, the track hit No. 1 on the Hot Dance Music/Club Play chart. The third album, In Motion was released 6 August 2001. This album contained the real trance sound and was very popular in the United States. A fourth album, Transparence, followed in 2002. In 2003, he worked with such artists such as DJ Seth Alan Fannin throughout a global tour on Dance Revolution in Europe, selling out to crowds of 20,000 people in Armin's home country of the Netherlands.

In March 2001, Van Buuren started his own radio show on ID&T Radio (traditionally broadcast in Dutch and later English since ASOT 183). In this weekly two-hour show, entitled A State of Trance, he plays the latest popular trance music tracks. His show and the artists he features are popularized by publishing the artists and track titles on his website. This radio-show/website combination has proven popular internationally. When ID&T Radio changed genres in 2004, Van Buuren left and took A State of Trance with him. The show then moved to Fresh FM, a Dutch radio station. It is now a weekly feature on SLAM!FM, another Dutch radio station, DI.FM, an online radio station, and on XM Satellite Radio, channel 80 in the United States and Canada. A complete list of stations that broadcast A State of Trance can be found at the ASOT section of Armin's website. Also in 2004, Van Buuren remixed the 24 theme song into a trance hit. In June 2005, the 200th episode was celebrated in Amsterdam and subsequently aired on radio. The 250th (eight hour) anniversary episode was celebrated in Club Asta in The Hague, Netherlands, featuring Van Buuren, Jonas Steur, M.I.K.E., John Askew, Rank 1 and Menno de Jong.^{[citation needed]}

In 2002, he had a residency at Glow in Washington D.C.,^[9] and he has played all across North America in San Francisco, Vancouver, Houston, Toronto, Boston, Calgary, Charlotte, Chicago, Montreal, Detroit, Edmonton, Atlanta, Austin, Denver, New York City, Los Angeles, St. Louis, Minneapolis, Seattle and at The Necto (nightclub). He has also regularly appeared at Amnesia on the island of Ibiza, Balearic Islands, Spain. In October that year, Van Buuren was voted Number 5 in the DJ Magazine 100 top DJ's. The following year, he jumped up to the No. 3 spot, and held 3rd place for the next three years. His work left him at the No. 2 spot, just below Paul van Dyk in the 2006 polls, and, in 2007, Armin reached #1, heading the 2007 DJ Mag Top 100. He was voted No. 1 again in 2008, 2009 and again in 2010.^{[citation needed]}

In June 2003, Van Buuren released his debut studio album, 76, a 76-minute album divided into 13 tracks.^[12]

Armin Van Buuren performing at Avalon, Boston, Massachusetts 2007

[edit] 2005–present: Shivers, Imagine and Mirage

On 8 August 2005, Van Buuren released his second studio album, Shivers. On the album Van Buuren worked with artists such as Pakistani-American singer Nadia Ali, English singer Justine Suissa and American trance duo Gabriel & Dresden.

On 11 November 2006, he had a live performance called Armin Only in Ahoy Rotterdam for the second time (after 12 November 2005) with a nine hour solo set, where he performed to over 11,000 fans.

In the summer of 2007, Van Buuren recorded and released a live set at Amnesia, Ibiza. Universal Religion Chapter 3, Live from Amnesia at Ibiza was released on 28 September 2007 as a mix compilation on Armada Records and in the US as "Universal Religion 2008" on Ultra Records on 4 December 2007.

On 17 April 2008, Van Buuren released his third studio album, Imagine. It features collaboration with singers such as Sharon den Adel of Within Temptation and Jacqueline Govaert of Krezip. The album debuted at number one on the Dutch Albums Chart. Since the release of Imagine, Van Buuren has been working with Benno de Goeij and DJ-RA of Rank 1 on solo productions and remixes.^{[citation needed]}

19 April 2008 saw the 3rd edition of Armin Only, this time in the Jaarbeurs in Utrecht, Netherlands. The event was attended by 16,000 fans and (partly) broadcast live on Dutch National TV. During the second half of 2008, Van Buuren took this show abroad, with visits to Australia, Romania, Poland, Belgium, and a special New Years Eve 2008 show at Together As One in Los Angeles, U.S.

On 29 September 2008, Armin won the DJ Award for "Best Trance DJ" at Ibiza along with other nominees, that of Tiësto, Ferry Corsten and Paul van Dyk.

On 12 January 2008, Van Buuren was given the "Buma Cultuur Pop Award," the most prestigious Dutch music award.

In 2009, Foreign Media Games announced the production of In The Mix: Featuring Armin van Buuren, a music game being produced in collaboration with Cloud 9 Music and Van Buuren's Armada Music label. The title is scheduled to be released sometime in 2010 exclusively for the Wii console.^[13]

He has collaborated with his brother, guitarist Eller van Buuren, in such venues as Together As One in Los Angeles, U.S., on New Year's Eve 2009, as well as on Armin's 2008 album Imagine.

On 3 March 2010, Van Buuren was awarded with the prestigious Golden Harp, for his musical work and contribution to Dutch music, by the music collecting society BUMA/STEMRA at the 2010 Buma Harpen Gala in Hilversum, the Netherlands.^[14][15]

On 23 June 2010, it was announced that Van Buuren's fourth studio album, Mirage was due to be released on 10 September.^[16] The first single "Full Focus", was released through iTunes Store on 24 June at midnight.^[17] The song peaked at number sixty in the Netherlands. One of the confirmed tracks from the album is a collaboration with English singer Sophie Ellis-Bextor called Not Giving Up On Love, which was released as a single from Bextor's fourth studio album, Make a Scene.^[18][19] Armin also wrote a song for English singer Seal, but due to the release of his greatest hits album, Hits, the collaboration never came together.^[20]

On 12 September 2010, Van Buuren launched "A State of Sundays", a new weekly 24-hour radio show aired on Sirius XM Radio ^[21]

On 20 October 2010, Van Buuren won the award for Most Popular International DJ presented by The Golden Gnomes.^[22]

On 27 October 2010, Van Buuren was announced, for the 4th year running, as the number 1 DJ, and thus prolonging his title as 'Most Popular DJ in the World'.^[23]

The 2010 edition of Armin Only: Mirage kicked off on 13 November 2010, in Utrecht, Netherlands, with more shows coming in Saint-Petersburg, Kiev, Buenos Aires, Melbourne, Beirut, Poznań, Moscow and Bratislava .^[24]

On 27 November 2010, Van Buuren made his third appearance in Shanghai, China.

On 2 February 2012, Van Buuren mentioned a new studio album in the works on episode #546 of his radio show, "A State Of Trance".

A State of Trance 500 (ASOT 500)[link]

To mark the 10 year anniversary and 500th episode of his weekly radio show A State of Trance, Van Buuren performed at five shows across five continents over five consecutive weeks along with various artists.

The first show was held on 19 March 2011 in Johannesburg, South Africa at the MTN Expo Center. In addition to Armin, Blake Jarrell, Protoculture, Lange, Leon Bolier, and Jorn van Deynhoven were performers. Super8 & Tab were to be part of the South African show, however a flight cancellation caused them to be absent for the event. The event was attended by over 20,000 people.

Miami's show was performed at the Ultra Music Festival on 27 March, and part of the show were Marcus Schossow, Alex M.O.R.P.H., Cosmic Gate, Gareth Emery, Ferry Corsten, ATB, and Sander van Doorn.

Argentina held the third celebration of ASOT 500 in club G.E.B.A Buenos Aires, with Heatbeat, Jochen Miller, Dash Berlin, Markus Schulz, John O'Callaghan and W & W. It was the only of the five ASOT 500 celebrations that was held outdoors. Van Buuren recorded a live video with his cell phone and uploaded it to Twitter while playing his live set.

ASOT 500 was celebrated in the Netherlands in Den Bosch. Accompanied by more than 30 DJs from countries all over the world, the event was attended by over 30,000 people. DJs present included Markus Schulz, Gareth Emery, Above & Beyond, Paul Oakenfold and Sean Tyas. The event was radio broadcast live to over 30 countries.^{[25][dated info]}

The final show was held in Sydney, Australia on 16 April at Acer Arena in Olympic Park. It was a sold out event weeks before the night. Artists present included Shogun, tyDi, Menno de Jong, Aly & Fila, and Alex M.O.R.P.H. Van Buuren played for three hours.

A State of Trance 550 (ASOT 550)[link]

In March 2012, Van Buuren performed in six shows across three continents as part of ASOT 550. He began his tour on March 1 in London, continued on to Moscow on March 7, and to Kiev, Ukraine on March 10. Then, he traveled to the United States to host his show at the Beyond Wonderland festival in Southern California. A week later on March 25, he closed out Ultra Music Festival 2012 for the 5th edition. This was followed by the final show in the Brabanthallen of Den Bosch, the Netherlands.

A State of Trance sponsored a tent at the Electric Daisy Carnival at Met Life stadium in East Rutherford, New Jersey on May 19, 2012, which by all accounts could be considered an unofficial extension of ASOT 550. ^[26]

Discography[link]

• 76 (2003)
• Shivers (2005)
• Imagine (2008)
• Mirage (2010)

Year Mixes[link]

Van Buuren is well known for his annual "Year Mix" which incorporates clips and custom mashups from the year's most popular trance tracks. Each year-mix consists of about 85 individual releases, edited into a two hour mix which is released on double CD as well as aired on his weekly radio show at the end of each year. According to Van Buuren, each year-mix takes several months to make, including thousands of digital audio edits and hundreds of audio plugins.

References[link]